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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fda57a5f5b25ff7eacf9afcede8fcece3c214799ec7409698c65743213e2f727' 
  AND token = 'aXdyeGaxwJOjQ/okRS4Pd0ku/mmdzlN0cGnc8jzDKmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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