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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6788d09f9888b6ef0d6d767aa6d8a640a0f54c756519d972b5c57a6ae8c585' 
  AND token = 't6vSFe4f5c/p/rAfS8wA7Yg8hTo47R8S7jJvXB1/i5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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