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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b808e94e55fafd330ab0d4ef1b77e296e16086b5e879d6b55f4969ea040e253d' 
  AND token = 'CoNQewoy10EfqabGHJnLmu9r0QMxu6E7s9FbxSQpbJo=' 
  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"
    }
  }
}