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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '12c7bd3ff098066c34f562022bfe635f283252891876a69e569510196928abe2' 
  AND token = 're8bL9fV27gaq+aOB8u2HWJQgCFkTnOQHfJw851B+Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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