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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea2449ca517b0f102c851b0f6b8f9f8a093b34479127d0ac7dee29e713e309c' 
  AND token = 'PoTuiTI0w+Sdx0JWqlOI7S6LmgrG3JNOrI82aKCbb9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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