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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '09b7412ff09e25f939fd23178bba9c034fe980a8e462cd99d1123d85d7f1b344' 
  AND token = '+/HzeSAomWHdOMzCq6fipA0bgATIFynmRbjIVEEJBp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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