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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f370e926a173524f7f264113988cb367a1065168c10706eae1feb5bf7a5a018d' 
  AND token = 'OT+YquyCaGCy7qd6jlr6Lmh6749DwuRQtXQy8708Z94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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