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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4a2038a74bf74ea297a8a3988386c96f7f3aa7e309f53590da684e72a1e2a6' 
  AND token = 'NhYXe9+qaK1hrVSYFuJ+2NXU97UJgmIImtDB+p/EO1U=' 
  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"
    }
  }
}