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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616e03606e113723ae07221869d8a7648d3137d2f6e2c22ae82eba778bf12e43' 
  AND token = '2dWbVhbKZ2WEbwlTZBAPUlYOOyGip9AAdbU+A2xiacs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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