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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33cf9180ff5cfe5555b5e115ebe2811c3e5aa6f4260c221bd519d1fa22270f02' 
  AND token = '7qq6BU3WHL+H5pxiQcwVS9Trc2+sU4sbw5afLFovx7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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