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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f6195aca3dd2b7a9ec03d6d999f81f356613d2ec0cd1f47d7d3c6eb233a7a653' 
  AND token = 'B74MYNnoeo+hCkqnH62rh5NuGRGZAV6rY9bUntm49vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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