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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d92191a2f6f2928b519952eddb3b989cd1fd515c19f67d809eb28e216c39fe8' 
  AND token = 'CpuZmh9/HuaoG3VoF72Y6UiiEJq0jb6kU1va8ac5bAE=' 
  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"
    }
  }
}