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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e184350dce4b53b3ad1068656294f79580d9d1aab550569dc8bbd5288baa0b6c' 
  AND token = 'PYP/nJYtjMlE1fUNLVgn7oylalBjm5c4hDB8IIIPRqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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