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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7f40cfe0a3eb1127f457002491d341ebcad5b00be073ac1ca71dc3e9b64ee56b' 
  AND token = 'GoTWnFq+a6tGYIBpac/EpGq5Hx5Jdtd+6pSOYSsr+Bc=' 
  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"
    }
  }
}