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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '79c8f68de0f86bc360ca1f08743c138481702df4cbfcc871143d5f511eb8be9c' 
  AND token = 'MNWwTeSuhor/Ji93tXFGPyJU0aROV7dBW/D4FmL2m7k=' 
  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"
    }
  }
}