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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b541092d3bf101c76afdb7c2c4b42b6d4eea512009c869861121f465810213a3' 
  AND token = 'sd6rzbe1TAh34aaqa+V3nVyqwYD5ti50jyrLZG6myYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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