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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3302f02be83717364efac1a2a39c4e8970ba3c600d0295c3d07031c3235fe582' 
  AND token = '5XJex5jeZgtW4DLZeU8oHbNs3WBi6DL8NWh36bG95oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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