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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eafe0cf04f56ac2fdeb2313ff0539d1a9dc004f8f93ca6eb73aad6a5fb771e6' 
  AND token = 'V3HtIBzUBsyaJJWjp1bfi5Y5Nfre3zqo+meVbTMyYss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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