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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6ae06a5d060b6d3afe0b827148b142a345c7f0a686a5d9afb5b0c98ece1aebb5' 
  AND token = 'Ykbsp8ozEXMHiupyVneL0V66AzOODa6wr7x73yBF4RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00763

JSON explain

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