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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5aa29f991d958d7603aec650fec486f77f5e995efa6325e9298b7dcc6c641f6' 
  AND token = '+gBYpAAR2GxGOOPD7DJpX61PzmtCXOwv50cyutN4Uec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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