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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '90c40523f2232b378e02dea03039411c667b5e1609c45042b334bbbe9cecc549' 
  AND token = '+ztp5S3e0eY3TsqouUaL3tnT/0/ZY3AsX3L1upOZrgc=' 
  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"
    }
  }
}