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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9e34378a3904d7cad266a55d858c0914d2790979c7ab7ee50e623aead517cf' 
  AND token = '7DAtlN2t2tauvnc0IbgyagnLIaTDze8XSh8+eufbr7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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