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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e6822e4258743d3da9fc66374ec8225edb09d9f41c9b263a2b0fe4e3898622' 
  AND token = 'RyBRUkzGji+CXq7qCEyrmuH4lVf8xbqeHi2Bm0is2Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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