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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd5f4e7a1a00775ec20a306882696b9575b4ff30d140b8272f8af7e9aa8de2179' 
  AND token = 'gh8xVnPX0Zr07sZUPDY9+g14xHPsSswBhkmY9TX2Ehc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00748

JSON explain

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