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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e59dc7825507315c6936ba51a5ce14c0386fa61db4030afba433e6c425754004' 
  AND token = 'f13VAmz74WZC89dvMxKOs78LFtdFPXAiG7Jnr8x+kIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00758

JSON explain

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