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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '74f9a5908be906063497f365ed96dd936691d48717bb33749eff859428dc26cd' 
  AND token = 'wQEbH9ntKNwXz7PIs8Cdq7o8AfDGkv9q13uCJ8uHDHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00769

JSON explain

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