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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dff72034068df89afcecbe0d9e67a77426278908eb146fa1672990ce1558ca' 
  AND token = '3dc+1NA8fKoH1hrl8u50X8mY1pQPTm5AJnUHumzxnLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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