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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754c8d29d1cea330c7d824938214bc75bf012e65cfe90b9e00b22168dd19a165' 
  AND token = 'cBvvWKUBEYdiPzL81hh5iTa95NNg2+fdvpo6hJc9e8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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