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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c4b5e3a47e6e79c1bf63f8de2f584c67109264e76af04467e459ead6f888b5c2' 
  AND token = '5jX+fvGqzrZgbecgvv+eOL1OOzaYLfl60Y5ykCkp2PM=' 
  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"
    }
  }
}