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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c47632bba21f672a7a634768df8dd52e678d3e67ecbb1a75a56f6152fb4e489b' 
  AND token = '5wZcmo/upr2mtpkYwHc9OE8CEQqDGhwGq1ySWUQBMDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00858

JSON explain

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