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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec601c6931cd7f194d961051db52cd06e037313568b0a3f64790be2292c9af3' 
  AND token = 'GvHNqumns2tZWyMVR7iRWINmezSG5k1+Uf7GDMCzkio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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