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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9353ce0826fb674a39eb0bbbb09be470da8700b3e541b2c78cee32921afb70' 
  AND token = 'Vg+ccuiY5w+LOlzLqok/WJ1AWCAOZNgbGUcBn+OIsiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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