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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdecad863df206e00a961ae4e3a8bb2208b7623c547e65c1dc6a3a5e610b0d1d' 
  AND token = 'IgEZW2fTVERVNQ0O0gsy3U89Ad6sKqk3WR+GtGf4Jko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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