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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113f45b58f9b49765b769872536a82108417c96fc477f1bb9fb8136a4c7bde6c' 
  AND token = 'fZEnNYatNrOhvdF2uA6uVgbOM097koyP5ULJwjk7NHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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