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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfc18b494c83fb1b7e7c40f7311776bbaaeb4ca0b619c568ddabef87833225f' 
  AND token = 'p4r+JohJMtLuRdNI4OZuKihsCrDTOMndpSmDh9j5I4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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