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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3074d7f25b10e6783b15832c84843d4d781670d51f558ec582ddd031d91f0ba' 
  AND token = 'Hl61rUm6QxA/hQhUx813r63toMq6yYQ0xVyDz6jT87U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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