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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8abd7bb8f72fba4019fb0a0286aa494dbad7804085cb9e6cf723550ea8310ba3' 
  AND token = '9CgV+7alqNI0mucrSYx0ml5TPGWAwbX6zqgakEGVA5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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