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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b95d4f2ac673b0d4e8c914454ec4546468e1a8e4b845b7270909db2eb2a58ae3' 
  AND token = 'Bg1hdTXt/R1WoEGKITMBLYHek1a+rhHQ72ajVAL0izA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00877

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}