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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cfad6d5cd82091e4058cd14c2500ffe21b162d28c6c87233cde00bbc9fae869' 
  AND token = 'qeUDpDx8+XtW3tU4Ut5x8FSjwwQIxDmGhHy3yRnYlHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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