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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2ef6d1a5a14a8f83bd840b140ee1a98e646df7fc937e0ed6c6ca40f928e58701' 
  AND token = 'I/bthwqYnw4H6y8wBpgCqBE+D1djbUNDNrkMvwV2dMo=' 
  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"
    }
  }
}