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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e828c94d8c503049c076fb294d4c810c6cd40c501b3beaefe04646bd0b4f1e38' 
  AND token = 'aUdlGchmgVI/oHbpThHKf+onBxTKET8CeFO6lG14q80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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