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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b16771ec79dfea5ede710c2c2cc576df65d37f08cc6c17514e43b572d5a86a' 
  AND token = '+e5/izqOAhSBR6L3CfJjKGKmUo2CeUnboDyzVE2ZZuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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