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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb16fd0f8d5180b62ce4cb3222764f8090f02b255797433c124494ac66e208c' 
  AND token = 'pQ+MPtGrCj3gkV93e5fKwliP8Upo3820vpihFP6ZLRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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