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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '82d1dfb1f62ee3015a171ce2ac6398d737d2d2def1437d0e344dd7b9014021b8' 
  AND token = 'whRDQZUHeGdOA1rw2lbNgK9w7szsGGjOEmHL3EULuZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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