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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a932f9f06aa6eb1434f29bfe71904bf232d8c198081d1ed4b8ce2f52d3698510' 
  AND token = 'JB8cqDbRm8A9zFYfcgfz3juHQf4SYEwbHE04817V78g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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