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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8383252c8c2685a764bc5c41280563c220b264a75034e03dedc91c1f5631bcca' 
  AND token = '22TrT1h6v7Mppq9yweD4AfyCdK782DMQwOTUTWHe9sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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