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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c3877f792c61b5cd8246dd404e9ff9e23d1f0bb5945b44e6f5654d4869280462' 
  AND token = 'UOjqEw6rHD4w2r0J7jok0YPlVRhIT9USK8BOkLzSe0E=' 
  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"
    }
  }
}