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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee5e1f8f837647ecf2fe74d1923a429c30920489671de9b793f86fa96e745d0' 
  AND token = 'R3sv5T8mzF+zZphT+s1YPi5vENKlZNGybTsadtFz/fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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