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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981dba557bcbe1f691d8ffe4102ebda45e4f5720b3fadc5612f616dd1daeae43' 
  AND token = 'gT9doDOZRguweCY/8SOvN3f5RTL76pdqAmb6CPmSx1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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