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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27963861593543d59d55f888566290e4778629c7e484452643633ade2f0a03b1' 
  AND token = '5sD39JWIWxvOuMif2a8VCgSuZwWJb4f+3NB8iNOzUjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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