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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee34c20f6acdd5496662b2c5ef404998baa294a70051f58641b7114fb5b52a4' 
  AND token = 'Fyg0QZM6TG2EAflS5+wlmwnyevMPqaxCbHsp8tbDbjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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