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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f503a279cc47d62e5796c7d4308be1f7695ac2231224f0eae01a95fd21e676' 
  AND token = 'laUmYu9m2y1HwbQfayPAyIaVF4uC1XEXX+AeOI1FmYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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