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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1805e7527110d9d56c325f7f237701bb2ada343546b94144899cbbcc13e987ce' 
  AND token = 'RM0j4wG7pFQ7Xu33glbXia5p3enAjyDr+VfOO1upR6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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