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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9c0292dd9592496404fd2e51b58af3c8394d5363a8d50df15d518227dc6efc' 
  AND token = '/NqtBKa/HvBhsOKNH2De4s1mng3BK6dQXbkH/XLs8Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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